Hello gRPC_python developers,
for our new, open lab device automation standard
(https://gitlab.com/SiLA2/sila_python) we need to run the devices in two
modes: a simulation mode and a real mode (with the same set of remote
calls, but in the first case it shall just return simulated responses in
the second it should communicate with the hardware.
My first idea was to create two almost identical gRPC servicer python
classes in separated modules, like:
in hello_sim.py:
class SayHello(pb2_grpc.SayHelloServicer):
#... implementation of the simulation servicer
def SayHello(self, request, context):
# simulation code ...
in hello_real.py:
class SayHello(pb2_grpc.SayHelloServicer):
#... implementation of the real servicer
def SayHello(self, request, context):
# real hardware code
and then, after creating the gRPC server in server.py I could switch
between simulation and real mode by
exchanging re-registration of the servcier at the gRPC server like:
grpc_server = GRPCServer(ThreadPoolExecutor(max_workers=10))
sh_sim = SayHello_sim.SayHello()
sh_real = SayHello_real.SayHello()
SayHell_pb2_grpc.add_SayHelloServicer_to_server(sh_sim, grpc_server)
grpc_server.run()
..... and later, still while the same grpc server is running,
re-register, like
SayHell_pb2_grpc.add_SayHelloServicer_to_server(sh_real, grpc_server)
to be able to call the real hardware code or by exchanging the
reference to the servicer object, like
grpc_server = GRPCServer(ThreadPoolExecutor(max_workers=10))
sh_sim = SayHello_sim.SayHello()
sh_real = SayHello_real.SayHello()
sh_current = sh_sim
SayHell_pb2_grpc.add_SayHelloServicer_to_server(sh_current ,
grpc_server)
grpc_server.run()
..... and then later, still while the same grpc server is running,
re-register, like
sh_current = sh_real
# so that the server would just use the other servicer object for the
next calls ..
but both strategies are not working :(
My question now is: how can I re-register Servicer code with the same set
of calls, but calling different methods carrying the same name while the
same gRPC server is running ?
(I know, that I could stop the server, re-register and restart, but then I
would loose the connection to the client)
Do you have any suggestions for a clean and elegant solution ?
Thanx a lot in advance,
Lara
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